In Ottawa, Air Canada flights to and from London, Ont., Toronto and Montreal were cancelled, while a handful of other flights to Calgary and Atlantic Canada experienced delays.

A handful of flights out of Montreal to locations such as Cancun, Orlando, Vancouver and Fort Laudersale were delayed, while flights to New York City, Toronto, Houston, Ottawa and Labrador were cancelled.

Air Canada has promised to waive fees for anyone who has to change their flight and is encouraging passengers to check AirCanada.com or call 1-888-247-2262 to check the status of their flights.

On Thursday evening, Gerry Rogers, an NDP member of the Newfoundland and Labrador legislature, said passengers on her flight from St. John's, N.L., had to wait an hour after it had landed to leave the plane due to the action. She had been waiting another hour to retrieve her baggage when she spoke to QMI Agency.

She said Conservative MP Tony Clement was also on the flight.

"Take that, Harperite union busters," she said in an online message.

Earlier this month the federal government intervened in Air Canada's contract disputes with pilots and machinists and passed legislation to prevent a lockout or strike.

The airline is also scrambling to replace the services of its in-house maintenance division Aveos, which has obtained bankruptcy protection